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Segment Information (Acquisition of Investment in Films and Television Programs and Program Rights by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	$ 1,470.0	$ 1,526.4	$ 1,092.0
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	388.4	462.0	412.7
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	681.6	706.8	506.6
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	594.3	483.5	218.6
Intersegment Eliminations
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	$ (194.3)	$ (125.9)	$ (45.9)

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Acquisition of investment in films and television programs and program rights.

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